Click on a thumbnail to see the full image.



abacus1

abacus2

abacus3

abacus4

abacus5

abacus6

abacus7

abacus8

abacus9

abacus10

abacus11

abacus12

abacus13

abacus14

abacus15

abacus16

algebra1

educate1

decrypt

amplitude_modulation

arabic_culture1

arabic_culture2

arabic_culture3

arabic_culture4

arabic_culture5

arabic_culture6

arabic_culture7

arabic_culture8

arabic_culture9

arabic_culture10

arabic_culture11

arabic

arabic2

arithmetic1

arithmetic2

arithmetic3

arithmetic4

arithmetic5

arithmetic6

arithmetic7

arithmetic8

arithmetic9

arithmetic10

arithmetic11

arithmetic12

arithmetika

armillarysphere

instrument1

instrument2

instrument3

instrument4

instrument5

instrument6

instrument7

instrument8

instrument9

instrument10

balseiro

best

binary1

binomial

binomial2

borromean

schick

calculate1

statistics1

ceva

colombia1

colombia2

computing1

computing2

counting6

counting7

dodecagon

dodecahedron

esa

enigma

escalante

euclidean1

congress1

expedition

fibonacci2

sunya

maya2

khowarizmi2

vonkoch

fractal2

fractal1

fractal3

fractal4

fractal5

french_academy_sciences

french_academy2

ecole1

ecole2

ecole3

ecole4

ecole5

gamm

gazeta1

gazeta2

geometry

geometry2

geometry3

geometry4

geometry5

geometry6

geometry7

geometry8

geometry9

geometry10

geometry11

geometry12

geometry13

geometry14

geometry15

geometry16

geometry17

geometry18

geometry19

geometry20

geometry21

geometry22

geometry23

geometry24

geometry25

geometry26

goldensection

goldensection2

goldensection3

goldensection4

goldensection5

goldensection6

goldensection7

goldensection8

goldensection9

goldensection10

goldensection11

gomboc

graph1

graph2

graph3

graph5

graph6

graph7

graph8

graph9

graph10

graph11

graph12

graph13

graph14

graph15

graph16

graph17

graph18

graph19

graph20

graph21

graph22

graph23

graph24

graph25

graph26

graph27

graph28

graph29

graph30

graph31

graph32

graph33

graph34

graph35

graph36

graph37

graph38

graph39

graph40

graph41

graph42

graph43

graph44

graph45

graph46

graph47

trigsurv

hms

hexagon

hieroglyphics

hieroglyphics2

hieroglyphics3

hieroglyphics4

hieroglyphics5

histogram

histogram2

counting1

counting1a

counting2

counting2a

counting3

counting3a

counting4

counting4a

counting5

counting5a

impossible1

impossible2

impossible3

impossible4

impossible5

inca

ims

inscribed

geometricians

icm1

finland

icm90

imk

imk2

icm2006

icm2014a

icm2014b

icm2014c

icm2014d

olympiad_2019

statistics2

statistics3

jacob

jcmf1

jcmf2

jcmf5

jcmf3

jcmf6

jcmf4

formula1

formula2

formula3

formula4

formula6

formula7

formula8

formula9

formula10

lissajous

magic1

magic2

magic3

magic4

magic5

magic6

magic7

magic8

magic9

competition

polynesia

irankonf

hungary1

icms1

cong1

maya

melancholia

melancholia2

melancholia3

metric1

metric2

metric3

metric4

metric5

metric6

metric7

metric8

metric9

metric10

metric11

metric12

metric13

metric14

metric15

metric16

metric17

metric18

metric19

metric20

metric21

metric22

metric23

metric24

metric25

metric26

metric27

metric28

metric29

metric30

metric31

metric32

metric33

metric34

metric35

metric36

metric37

metric38

metric39

metric40

metric41

metric42

metric43

metric44

metric45

metric46

metric47

mission1

mission2

mission3

mission4

mission5

mission6

mission7

mission8

mission9

moebius

moebius2

moebius3

moebius8

moebius9

moebius4

moebius5

moebius6

moebius7

multiplication_table

negative

numerals

numerals2

numerals3

numerals4

numerals5

octagon

octahedron1

octahedron2

optical

paper_folding

parabola

triangle1

triangle2

clock

pi

pi2

polyhedron

vatican1

vatican2

prime

quaternions

raphael1

raphael2

raphael3

raphael4

raphael5

raphael6

raphael7

raphael8

raphael9

raphael10

raphael11

romania1966

romania1966a

rutherford1

macau1

macau2

macau3

macau4

macau5

macau6

stem1

stem2

stem3

stem4

sine

sliderule

solids

spiral

spiral2

spiral3

sputnik

subtraction

symbols1

symbols2

symbols3

calculation

calculation2

workers

workers2

teaching1

teaching2

teaching3

teaching4

teaching5

basel1

basel2

william

belgium1

italy2000

fermat-wiles

portugal1

portugal2

spain00

monaco2000

croatia2000

slovakia2000

luxembourg2000

korea2000

argentina2000

hungary2000

hungary2000a

hungary2000b