Hình ảnh - A day with mathematics

IMG_7618
IMG_7618
Detail
IMG_7624
IMG_7624
Detail
IMG_7640
IMG_7640
Detail
IMG_7644
IMG_7644
Detail
IMG_7648
IMG_7648
Detail
IMG_7651
IMG_7651
Detail
IMG_7657
IMG_7657
Detail
IMG_7665
IMG_7665
Detail
IMG_7671
IMG_7671
Detail
IMG_7677
IMG_7677
Detail
IMG_7697
IMG_7697
Detail
IMG_7702
IMG_7702
Detail