Ruimtefiguren https://www.youtube.com/watch?v=C-Uc4-sTacM&list=PLqmYEL-9zWjOHe42KExqEuhMJtZPAYco5&index=8
Kubus https://www.youtube.com/watch?v=N3p_R32Phc4&list=PLqmYEL-9zWjOHe42KExqEuhMJtZPAYco5&index=9
Balk en Kubus tekenen https://www.youtube.com/watch?v=NxZLcrF6Cj0&t=86s