I found this activity on Lakeshore Learning and got it as part of a donorschoose grant. It is an awesome, hands-on way to work on prepositions (which so many of my students struggle with). I also like the visual cards that come with it to help my students understand the directions. It comes with 4 different sets of props to use. Each set has 6 cards covering different prepositions. On the back is a picture of the correct answer. I like to use these to assess preposition skills as well as to work on practicing them. This is a great activity for paraprofessionals to be in charge of as well. It is simple and provides so much visual support, that very little prompting is needed. Sometimes, to test generalization skills, I will instruct students to take the object and place it somewhere in the classroom "under Johnny's chair," "behind the computer," etc. Today, we practiced with an M&M...their favorite direction to follow was "put the M&M IN your mouth."